For me being in year 11, I didn't revise a lot at all for my year 10 mocks and it really didn't affect me too much. I think the key things to consider are whether or not you know where you are at in terms of grades and if your hitting the targets you want to hit and also whether these mock results are the ones that will be sent alongside your college applications when you get to that point. For me, I already had a relatively good idea where I was at and was happy with it so I didn't feel the necessity to revise for that reason. Additionally, it was not my year 10 mocks that were sent to colleges but my first year 11 ones. So in summary, in my opinion, I wouldn't stress too much about these unless you think you need the extra practice/ want a good indicator of where you are at and/or they are getting sent with your college applications. (I also think that regarding what another user was saying with 6 hours of revision a day is completely overkill and would honestly be incredibly inefficient, if you do decide you want to revise a lot for these or frankly any big tests, it works significantly better to do smaller amounts of revision over longer stretches of time as this will secure the knowledge more and will also reduce the risk of burnout due to not leaving any time for relaxation/entertainment.)